Brake-shoe construction



Jan 6, 1931. c PETTls 1,787,547

BRAKE SHOE CONSTRUCTION Filed Oct. 22, 1927 2 Sheets-Sheet 1 Jail 6, 1931. c, PETTIS 1,787,547

BRAKE SHOE CONSTRUCTION Filed Oct. 22, 1927 2 Sheets-Sheet 2 I Patented Jan. 651931 onrnronin. rn'rris, or nnwyonxgiv. Y.

J nimxn-srionjoonsrnncrron Application filed ocean-e122, 1927. Seria1'No.' 227,9f1

r The present invention relates-broadly to the art of brake shoes, and more particularly to brake shoes; ofth e type having either a pressed metalshell or'a metalreinforcing back cooperatingwith the body of the shoe for carrying on strengthening the same.

It is customary "in the art to which the present invention relates to construct reinforced brake shoes of the character in which m the cast-iron body or the composite body, depending upon the character ofthe shoe, is either reinforcedor carriedby a shell or reinforcing back ofthe proper contour and" construction. "With'such a shoe, it is necesia sary to provide means for attaching the "shoe inoperative position for use, thisu'su'ally being accomplished by a the use ofta so-called center lu'gJ :The present invention iscon- 'cerne'd more especially with the construction of such center lug, whereby desirable results areobtained. v. In the accompanying drawings there are shown for purposes of illustration only, cer-.

tain preferred embodiments of the-present;

invention, it being understood that the drawings do not define the limitspof my invention as changes in the construction'and arrangement of the parts disclosed therein may be made without departing either from the spiritof the invention or the scope" of my broader claims.

In the drawings:

Figure 1 is atop plan view of-reinforcing and supporting'means for a brake. shoein accordance with the present invention;

broken away, of th'e construction shown in Figure 1;. p v

, Figure 3 is a perspective view; on an en-' larged'scale, of the center. lug of Figures 1 and2;- I V I Figure 4;is a side elevational view of the center lug of FigureB before the ends'thereof have been bent into interlocking arrangement'with the'reinforcin'g'means; v

Figure 5 is Maw similar to Figure 4,

illustrating a slightly modified embodiment ofthe invention; I w j a Figure 6 is a view similar to'Figures 4 art-that the present invention, as hereinafter 3; preferably v ntirely enclosed by the, metal of receiving a key for attaching the shoe in w v ends; A center lug, in accordance with the Figure 2 1s a side elevationalview, partly means, willibe of the form substantially as in a plane substantially normal-to the plane and 5 showing still ventiongand i a Figure 7" is an end elevation of the construction shown in Figure 6, i

It will be apparent'toj those skilledin the another form of the in- I described indetaihis not limited in its utility "with respect to any particular type of back or reinforcing means, and; that the form of shell shown herein is illustrative only. For piirposesfof convenience of de} scription, and not by way of'limitation, the term reinforcing means? will be hereinafter utilized'as definitive of shells, special backs, reinforcing inserts and the like, in connection with which the present invention may be utilized; 7 f V i In accordance with the present invention, there may beprovided a reinforcing means 7 2 of any desired c-onstruction, pro videdon 7o opposite sides of its transverse center line with transversely extending elongated slots of the reinforcing. means, and adapted for thereception of legs 4 formed in any desired manner on a center lug. or key lug 5. This center orkey lug, which is for the purpose place for use, is conveniently'formedof sheet 7 metal bent to provide a substantially flat top. Ghaving an overall length preferably substantially equal to but slightly less than the width of'a standard shoe, and carrying the downwardly projecting legs at-its opposite present'invention,prior to being assembled in cooperative relation-with the reinforcing shown in Figure 4: with the legs each lying of the back, whereby they may be easily passed through the openings 3 in the reinforcing mea-ns; lVith the form of my invention illustrated in'Figures l to 4: both-inclusive, theainount of insertion of the legs is limited by providing each of them on opposite sides thereof with cut-away portions forming downwardly operative shoulders or ofiset bearingportions' adapted to abut 1e 7 each leg.

against the back oftlie reinforcing means as clearly indicated in the drawings. v 7

After an attaching lug and reinforcing means have been assembled in the manner described, the legs are bent outwardly and upwardly into engagement with the under surface of the reinforcing means as clearly indicated inFig'ures 2 and 3. During .the

bending Operation the center lug is 'prefeiw ably lieldtightly in engagement with the reinforcing means Wherebytlie deformation of the legs will be effectivefor drawing the,

shoulders 7 into tight engagement with the back of the reinforcing means, thereby effectively closing the opposite ends of eachiof the slots 3 and preventing-the possible. escape; theretlirough of the cast metal or COHIPOSI-i tion or, special filling material; as the case may be. The bent up portions of the legs ar effective for sealing the outside edges of each of. the openings, and the flow of metal produced: by the application of bending pressure will slightly thicken the legs adjacentthe portions 8 where they extend through the reinforcing means, I thereby causingthe inside surface of each of the legs to tightlyengage the corresponding sides of the slots. In this 7 manner, the slots are completely closed on all of their sides against the possibility of the escape oftlie material "constitutingthe main body of the shoe. r

'1 At the same timegthe provision of a phirality of shoulders 7.0n each of the legs insures spaced :pointsof support effectively resisting distortion of thelugswhile in use.

In orderto increase the efiecti-veness of the bent over portions of the legs, andpreclude possibility of withdrawal of an attaching lug from a finished shoe, each of the legs is preferably provided with an area of clianging section; at some point throughout its length to thereby provide a more orless abrupt shoulder. 9 adapted to become interlocked withthefilling 1.0 ofthe shoe, a portioiionly of which is indicated in the draw ings. Suchan interlocking engagement rcsists any tendency of' the legs to straighten out while in use and thereby become disengaged from the reinforcing means.

In Figure 5, there is illustrated a slightly modified embodiment" of the invention in which the legs are each provided on their opposite sides with portions of clianging'section to provide a shoulder 9' on opposite sides of Insome'cases it may be desirable from a manufacturing or utilitarian standpoint to eliminate abrupt shoulders 7 of the character referred to and provide a leg, construction similar tothat shown in Fig. 6 in which the sidesof eachof the legs are provided with tapered portions 11 forming offset bearing portions adaptedto wedge the legs tightly in position as they are assembled with the reinforcing means, it bein understood that'the will .be of such dimensions as to slots provided for the reception of the legs insure an operation of this character. 1 v WVhile the taper imparted to the-legs may be relied upon to accurately position them with respect to the reinforcing means, it will, at least in some cases, be desirable to so construct the center lug as topreclu'de possibility of error during assembly. For this purpose each of the legs may be provided with a struck-out portion 12, as clearly shown in Figures 6 El-Ild'7, which portions are pressed out of the plane of the legs to provide shoulders 13 adapted to engage the back of the reinforcing means and definitely position the lugs with respectthe-reto.

: With all of the forms of my invention there are provided opposed bearing points for each of the legs on. opposite sides of each of the legs. This is notonly effective for more adequately'sealing the slots formed in the reinforcingmeans, but also for preventing relative movement betweenthe parts when assembled and giving added strength thereto.

; Other advantages of the invention arise from the provision-ofa centerlug provided not only with opposed bearing points or surfaces on opposite sides of eachof its legs, but also fromthe provision of legs of such construction as to more effectively interlock with the body-of the shoe and therebyresist any tendency of the same to straighten out. -Still other advantages of the invention arise from the provision of an attaching lug of such construction that accurate positioning thereof with itstop 6 in absoluteparallelisn with the plane of the reinforcing means'is insured;

I claim: 1. As an article of manufacture, an at taching lugfor brake shoes, comprising abody portion having a plurality of legs formed on each side thereof and combined bearing, and movement restricting portions on opposite sides of each of saidlegs adapted to properly position the lug with respect to brake shoe reinforcing means. v

"2. Asan article of manufacture, a lug coniprising atop portion having legs projecting therefrom, a plurality of offset bearing portions oneach of said legs, and'me'ans on each of said legs adapted to interlock with the ma terial constituting the body of a brake shoe. 7 As an article of manufacture, an attach ing lug for brake shoes comprising a top liavinga plurality of legs projecting from each side thereof, and opposed'oifsetbearingsurfaceson opposite .sides of each of said legs;

- 4. As an articleof manufacture, an attaching lug for brake shoes comprising a top having a. plurality of legs projectingjtlierefrom,

and opposed oflsetbearing surfaces on opposit-e sides of each of said, legs,.said legs beingcut awaybelow said bearing portions I to provide areas of changing section adapted to interlock with the body of-abrake shoe.

5. As an article of manufacture, an attaching lug for brake shoes comprising atop having legs thereon, a tapered bearing portion on each of said legs, and means cooperating with said tapered bearing portlons and facilitating the assembly of the lugs with reinforcing means.

6. As an article of manufacture, an attachs ing lug for brake shoes comprising a top l1aving a plurality oflegs, each of said legs having a tapered bearing surface formed thereing lug for brake shoes comprising atop having a plurality-of legs, each of said legshaving a tapered bearing surface formed thereon, and also having a portion of changing section below said bearing portion and'adapted to interlock with the material comprising the body of the-shoe.

8. As an article-of manufacture, an attaching lug for brake shoes, comprising a body 7 portion having aplurality of legs formed on each side thereof in spaced relationship,and

'ofl'set bearing portions on opposite sides of each of said legs adapted to properly positionthe lug with respect to the brake shoe reinforcing means.

9. As an article of manufacture, an attaching lug for brake shoes,comprising a body portion having a plurality of legs formed on each side thereof inspaced relationship," and ofiset bearing portions on opposite sides;

of each of said legs adapted to properly position the lugwith respect to the brake shoe reinforcing means. each of said legs having means thereon adapted to interlock with the material constituting the body of a brake 10. A brake shoe comprising reinforcing means provided with four slots, and a center lug shaped to provide four legs for cooperating with said slots, said legs each being formed on opposite sides thereof with offset bearing portions.

11. A brake shoe comprising reinforcing means, and a center lug having a body portion formed on each of opposite sides with a plurality of legs, each of said legs affording a plurality of points of engagement with the reinforcing means tending to resist relative movement between the reinforcing means and lug in any direction, the reinforcing means being traversed by slots, one for each le In testimony whereof I have hereunto set my hand.

CLIFTON D. PETTIS.

7. As an article of manufacture, an attach- 

